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  • 1
    facet.materialart.
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    German Medical Science GMS Publishing House; Düsseldorf
    In:  Jahrestagung 2012 der Sächsischen Augenärztlichen Gesellschaft; 20121130-20121201; Leipzig; DOC12sag43 /20121128/
    Publication Date: 2012-11-29
    Keywords: ddc: 610
    Language: German
    Type: conferenceObject
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  • 2
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    German Medical Science GMS Publishing House; Düsseldorf
    In:  Jahrestagung 2010 der Sächsischen Augenärztlichen Gesellschaft; 20101126-20101127; Dresden; DOC10sag06 /20101124/
    Publication Date: 2010-11-24
    Keywords: ddc: 610
    Language: German
    Type: conferenceObject
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  • 3
    Keywords: AGE, aneurysm, ANEURYSMS, Aorta, CLINICAL-TRIAL, DATABASE, DEATH, elderly, ELDERLY-PATIENTS, endovas
    Abstract: During the past decade, endovascular aneurysm stent graft repair (EVAR) of abdominal aortic aneurysms has emerged as a less invasive and less burdening alternative to open surgical repair. We hypothesize that EVAR may become the treatment method of choice among elderly patients. During a 7-year-period, EVAR was performed in 654 patients at our institution. One hundred fifty seven (20%) of these patients were older than 75 years. Our prospectively acquired database was reviewed with respect to midterm results of this elderly population. Aneurysm-related events (aneurysm-related death, endoleaks, conversion, renal infarction or aneurysm rupture) and secondary interventions were the main study endpoints. There were significantly (p 〈 0.05) higher endoleackage-, conversion and renal infarction rates among this subgroup of patients. In addition, aneurysm related morbidity and mortality were significantly elevated (p = 0.0011). The discussion about early operation at younger age and smaller aneurysm diameter continues. Nevertheless, improved EVAR devices and surgeon experience may make improve future results. Elective endovascular repair failed to demonstrate any benefit in elderly patients (〉 75 yrs.) in the midterm outcome. In rupture, this procedure might be the treatment method of choice for patients in this age group who meet specific anatomical criteria
    Type of Publication: Journal article published
    PubMed ID: 17610189
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  • 4
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 107 (1985), S. 7267-7271 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 114 (1992), S. 3630-3634 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Binding of Zn2+ to imidazole (Im) and methyl imidazole (MeIm) is studied by ab initio methods as a model for the effect of cation binding on tautomeric energies. Gradient energy optimized conformations were obtained for all neutral and ionic structures, including the deprotonated molecules and the ylides. The N3—H tautomer of MeIm is calculated to be more stable than N1—H by about 1 kcal/mole. However, binding of a Zn2+ cation to the available nitrogen site is found to reverse the order of binding, leaving N1—H more stable by 1 kcal/mole. Binding of Zn2+ produces a significant perturbation in the electronic structure, a smaller shift in the equilibrium conformation of the imidazole ring, and only a small absolute shift in the relative tautomer energies. Methyl substitution at C5 has a small effect on both conformation and energetics.A high-energy ylide tautomer is produced by moving the proton bound to C2 to the N1 atom. The binding of Zn2+ to the C2 site is substantially stronger than to the N1 site, yielding nearly isoenergetic ZnIm2+ conformations for binding to either N or C atoms. For the deprotonated salts the lowest energy conformation has the C2—N3 bond bridged by Zn2+.
    Additional Material: 7 Tab.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Computational Chemistry 4 (1983), S. 127-135 
    ISSN: 0192-8651
    Keywords: Computational Chemistry and Molecular Modeling ; Biochemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Computer Science
    Notes: A relativistic effective core potential (REP) has been generated for the uranium atom and used in self-consistent-field calculations of the A states of UH, UF, and their ions. Energy curves were calculated at the base configuration level which ensures the dissociating atoms are described by Hartree-Fock wavefunctions. The electronic bonding of these molecules is found to be similar to that of comparable alkaline-earth hydrides and fluorides. The uranium 6p, 6d, and 5f orbitals retain their atomic character but the orbitals extend into the bonding region and are distorted by overlap repulsion and electrostatic effects. Nonetheless, the atomic energetic coupling determines that low energy states will have the maximum spin multiplicity and maximum orbital angular momentum projection consonant with the charge-transfer bonding.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Computational Chemistry 6 (1985), S. 287-295 
    ISSN: 0192-8651
    Keywords: Computational Chemistry and Molecular Modeling ; Biochemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Computer Science
    Notes: Relativistic effective potentials (REP) are now widely used in molecular electronic structure calculations. Tests of these REP are needed to assess their accuracy. This can now be done for AgH and AuH since Lee and McLean have published Dirac-Fock calculations for these molecules. Comparative SCF calculations have been performed for two types of effective potential. Satisfactory agreement between the effective potential results and Dirac-Fock values is found for spectroscopic constants and dipole moments, which supports the use of these potentials for heavy atom containing molecules.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Computational Chemistry 3 (1982), S. 372-380 
    ISSN: 0192-8651
    Keywords: Computational Chemistry and Molecular Modeling ; Biochemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Computer Science
    Notes: Spin-orbit and dispersion energy contributions to the energy curves of XeF are examined. A rapid variation in the spin-orbit coupling with internuclear separation is found for both the ground and excited states. This result can explain the experimentally observed ordering of the ionic excited states when the spin-orbit perturbation couples 2σ and 2π energy curves obtained by both all-electron and effective core potential (ECP) calculations at the first-order configuration interaction (FOCI) level of accuracy. Damped dispersion energy contributions to the ground-state energy curve are shown to be comparable to the charge transfer contribution. The energy curve for XeF is in reasonable agreement with experimental results and a calculation of the analogous XeCl curve confirms the qualitative correctness of the calculation. The energy curves and transition moments were then applied to two problems related to the efficiency of the XeF laser. Photodissociation of the X state provides a means of removing a bottlenecked vibrational level but a calculation of the radiative transition probability between the X and A states finds the cross section is too small to yield rates competitive with collisional deactivation. The bottlenecked state may also be removed by electron dissociative attachment but the calculated energy curves for the X states of XeF and XeF- do not cross at a low energy indicating a small cross section.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 8915-8924 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A cluster model for the binding of Cs atoms on the (110) surface of GaAs is examined for polarization, charge transfer, and dispersion interactions. Binding energies for two or three atom clusters on GaAs are calculated to be less than 0.1 eV per Cs atom indicating only small binding contributions from charge transfer and polarization. Orbital and total charge density plots reveal an alkali valence charge weakly bonded between the alkali atoms and polarized toward the Ga atom. A London analysis of the dispersion energy between quasilinear Cs clusters and GaAs clusters finds it is large compared to the difference in stability between polyhedral clusters and the quasilinear clusters that are experimentally observed on the GaAs surface. The large dispersion energy is due to the large polarizabilities for quasilinear chains of Cs atoms whose longitudinal component increases approximately with the square of the chain length.
    Type of Medium: Electronic Resource
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